Windows 10: Un-allowed DMA capable bus/devices detected - [Error Message from MSInfo32] possible cause...

Un-allowed DMA capable bus/devices detected - [Error Message from MSInfo32]I'm trying to get Virtualization-based security measures implemented but I get the above error message.I have: Window 10 ProI have disabled BitLocker automatic device encryption, plus turned it completely BitLocker is not really involved in this problem, so I'm just trying to head-off that suggestion.I have confirmed that my computer has no external DMA ports.I have an installed and enabled TPM.Synopsis of the Problem:In the following website, they suggest checking the Registry List of 'un-allowed Buses', as describ

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Un-allowed DMA capable bus/device(s) detected - [Error Message from MSInfo32] possible cause - MS 2006 driver?

Un-allowed DMA capable bus/device(s) detected - [Error Message from MSInfo32]

I'm trying to get Virtualization-based security measures implemented but I get the above error message.

I have: Window 10 Pro

I have disabled BitLocker automatic device encryption, plus turned it completely (BitLocker is not really involved in this problem, so I'm just trying to head-off that suggestion.)

I have confirmed that my computer has no external DMA ports.

I have an installed and enabled TPM.

Synopsis of the Problem:

In the following website, they suggest checking the Registry List of 'un-allowed Buses', as described immediately below and I identified PCI-to-PCI Bridge as a likely suspect. Then I went through 'Device Manager' looking for this Bridge. I have nine instances of this Bridge on my computer, and they all have the 'un-allowed' device driver. Note that the Driver IDs are the same. The driver is old (2006) and it is a Microsoft driver. I tried to update the driver, but one couldn't be found, so, apparently, no new driver exists. So, how do I deal with this? If I try to delete these Bridges, they will just re-appear again. What do I do? Is there a newer driver somewhere?

Details and Evidence:

MSInfo32: Error Message:

Reason for failed automatic device encryption: Un-allowed DMA capable bus/device(s) detected.

from:

solution 1:

Both the blacklist and whitelist are in your registry at

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DmaSecurity\Default\UnallowedBuses

In my computer at the above address, the Registry of UnallowedBuses is the following list:

[table][tr][td]Name[/td][td]Type[/td][td]Data[/td][/tr][tr][td]CardBus Bridge[/td][td]REG_SZ[/td][td]PCI\CC_0607[/td][/tr][tr][td]EISA Bridge[/td][td]REG_SZ[/td][td]PCI\CC_0602[/td][/tr][tr][td]EISA Plug and Play bus[/td][td]REG_SZ[/td][td]PNP0A01[/td][/tr][tr][td]IEEE 1394[/td][td]REG_SZ[/td][td]PCI\CC_0C0010[/td][/tr][tr][td]ISA Bridge[/td][td]REG_SZ[/td][td]PCI\CC_0601[/td][/tr][tr][td]ISA Plug and Play bus[/td][td]REG_SZ[/td][td]PNP0A00[/td][/tr][tr][td]ISA Plug and Play bus with VL slots[/td][td]REG_SZ[/td][td]PNP0A04[/td][/tr][tr][td]PIC bus[/td][td]REG_SZ[/td][td]PNP0A03[/td][/tr][tr][td]PCI Express Root Complex[/td][td]REG_SZ[/td][td]PNP0A08[/td][/tr][tr][td]PCI-to-PCI Bridge[/td][td]REG_SZ[/td][td]PCI\CC_0604[/td][/tr][tr][td]PCMCIA Bridge[/td][td]REG_SZ[/td][td]PCI\CC_0605[/td][/tr][tr][td]SemiTransparent PCI-to-PCI Bridge[/td][td]REG_SZ[/td][td]PCI\CC_0609[/td][/tr][tr][td]ThunderBolt[/td][td]REG_SZ[/td][td]PCI\CC_0C0A[/td][/tr][tr][td][/td][td][/td][td][/td][/tr][/table]

from:

Device Manager > PCI-to-PCI Bridge > properties > Events [tab] > Information [box] >

Driver Name: pci.inf

Class Guid: {4d36e97d-e325-11ce-bfc1-08002be10318}

Driver Date: 06/21/2006

Driver Version: 10.0.19041.1

Driver Provider: Microsoft

Driver Section: PCI_BRIDGE

Driver Rank: 0xFF2006

Matching Device Id: PCI\CC_0604

Outranked Drivers:

Device Updated: false

Parent Device: PCI\VEN_1022&DEV_57AD&SUBSYS_00000000&REV_00\4&3167fc25&0&000A

End of Details

Robert

 

Reasons for failed automatic device encryption: Un-allowed DMA capable

Looking through MSINFO32 I see the line:
Device Encryption Support Reasons for failed automatic device encryption: Un-allowed DMA capable bus/device(s) detected

What does it mean? My laptop C:\ drive is encrypted the whole thing. Does this mean I have a problem?

I have these lines too:
Secure Boot State On
PCR7 Configuration Bound

MSINFO32-09-22-2017.txt

 

Un-allowed DMA capable bus/device(s) detected

Microsoft provides this documentation about this message.

Both the blacklist and whitelist are in your registry at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DmaSecurity. I’m not aware of an automated process to check this, though creating one should be pretty easy.

A typical candidate that exists on most systems is “PCI-to-PCI Bridge”. Curiously, “PCI Express Root Complex” is both in AllowedBuses and UnallowedBuses.